Fix #19041: Fix PHP 8.1 issues

framework/base/ArrayAccessTrait.php

@@ -26,6 +26,7 @@ trait ArrayAccessTrait
      * It will be implicitly called when you use `foreach` to traverse the collection.
      * @return \ArrayIterator an iterator for traversing the cookies in the collection.
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         return new \ArrayIterator($this->data);
@@ -36,6 +37,7 @@ trait ArrayAccessTrait
      * This method is required by Countable interface.
      * @return int number of data elements.
      */
+    #[\ReturnTypeWillChange]
     public function count()
     {
         return count($this->data);
@@ -46,6 +48,7 @@ trait ArrayAccessTrait
      * @param mixed $offset the offset to check on
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function offsetExists($offset)
     {
         return isset($this->data[$offset]);
@@ -56,6 +59,7 @@ trait ArrayAccessTrait
      * @param int $offset the offset to retrieve element.
      * @return mixed the element at the offset, null if no element is found at the offset
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($offset)
     {
         return isset($this->data[$offset]) ? $this->data[$offset] : null;
@@ -66,6 +70,7 @@ trait ArrayAccessTrait
      * @param int $offset the offset to set element
      * @param mixed $item the element value
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($offset, $item)
     {
         $this->data[$offset] = $item;
@@ -75,6 +80,7 @@ trait ArrayAccessTrait
      * This method is required by the interface [[\ArrayAccess]].
      * @param mixed $offset the offset to unset element
      */
+    #[\ReturnTypeWillChange]
     public function offsetUnset($offset)
     {
         unset($this->data[$offset]);